Improvement in steam-heaters



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' Mw-eetcafe- JOHN JOHNSON, OF SACO, MAINE, ASSIGNOR TO ENGLAND STEAMIIEATING COMPANY, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 85,176, lated December IMPROVEMENT IN STEAM-HEATERS.

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The Schedule referred to in these Letters Patent and mal-ring part of the same.

To all whom it may concern Beit known that I, J CHN JOHNSON, of Saco, 'in thc county of York, and State of Maine, have invented a new and useful Improvement in Regulatiiig-Apparatus for Steam-Heaters; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, and to the letters and figures marked thereon.

Figure I is an elevation' of the apparatus.

Figin'e II, top view'o' the same.

Figure III is an elevation.

Figure I V, top view ofthe same.

The nature of my invention consists in the application of a means of rendering latent heat sensible, and avoiding excess of pressure in the steam-chamber, its action being lsuch as to control or regulate both the internal pressure of steam, and the external .pressure of the atmosphere.

It is desirable that the heating-apparatus, for which Letters Patent were granted to ine, on the 7 th day of April, 1868, (No. 7 6,329,) should be made of light sheetf iron, instead of heavy plates; and by the use ofthe several parts hereindescribed, I am able to regulate the heat and pressure, as above mentioned, and prevent injury to the steam-heater or chamber.

Fig. I represents an open-mouthed vessel, in the form of au urn, A, placed upon the top of a stealnheating apparatus, B, in which a very small quantity of water is used. The lower part of the urn is fitted, steam-tight, to the top ofthe heater, as shown at X.

In' this urn I place a coil of metal pipe, P, of small diameter. `This pipe is soldered tothe urn, near its base, making it tight at this point, and forming a reservoir for containing the water V. v

A movable cover, G, rests uponthe top of the urn.

I purposely make the urn of greater depth than Width, and construct the coil in such a manner that it shall occupy the lower part of the urn. The end is brought upward, secured to the rod It, and then turned downward in the form of a Siphon, p

The 'curved portion, D, rises about level with the top of the urn; and, on illing the urn with water, the. end, E, ofthe pipe or coil is just beneath the surface, while the bend I) is a little above the water-line. In this position water cannot rise to fill the neck or bend of the tube, and consequently cannot, en illing the urn, act as a siphon.

- The urn-condenser is placed on the heater B, and is filled with water. A small quantity of water is put into the heater, (about two cubic inches, more or less, to one footl of space,) and, on applying heat, the air in the heater is raretied, andpasses out through the coiled tube at E, and continues so to do until the heater is filled with steam of atmospheric tension.

If the temperature of the apartment be such that the steam is not condensed as rapidly as it is formed at the surfaces in contact with the external air, the" excess of steam, in passingint0,the.coil,,loses its latent denser-pipe, but onl a very slight change of tempera-l ture ofthe heater,- the pressure or tension within the heater will be reduced, and this water will quickly reenter the heater, and air follow, thereby keeping up the original quantity of water that was placed within it.

The cover C husa large surface, and is made of suitable metal for radiating heat, and any vapor condensed thereon trickles down and falls within the urn.

it is desirable that a small quantity of water be used for condensation, the urn may be constructed as in Fig. III. In this drawing, the urn 'is set upon the heater B, supported on the legsG G. I

The steam-plug, X, of thisheater has an open pipe, H, for the escape of steam. Smroundingit is a cup,

I. A bent pipe, J, is inserted below the plug, and forms a trap or seal, being partially filled with water, to prevent the escape of steam.

The lower end of the condenser-pipe P is made trumpet-shaped, as represented at K.

As the steam issues out of the pipe H into the air,

it losesheat, the condensed water falls into the cup I,

and from thence, through the water-sealed pipe J, back tothe heater B, ready to be again converted into steam..

By means of this arrangement, less steam enters the. coil P, in the u rn, and, as the condensation takes place in part at the cup and funnel I K, less condensing- Water is required in the urn.

A moderate degree of tension may be produced within the heater or steam-generator, by bending one of the coils of pipe, P, in the form of an inverted siphon, so that it may fill with water, butas steam of 212o Fahrenheit contains the greatest amount of latent heat, and as this is the requisite in steam-heating, it is found that but little tension is required for the greatest eiciency. l

By the application and use of the device herein set forth, the steam, air, and water are regulated automatically, and I am able to construct steam-heaters of very thin metal, not liable to collapse or explosion, and that are light enough to be moved readily from place to piace, as required.

'What I claim, and desire to secure by Letters Patent, is-

l The automatic condenser and regulator, attached to steam-heating apparatus, constructed substantially as herein described, and for the purpose set forth.

JOHN JOHNSON. [1.. s] \Vitnesses:

JAMES D.4 HALL, .WILsoN M. Hosrnn. 

